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In cognitive psychology, Brown–Peterson task (or Brown–Peterson procedure) refers to a cognitive exercise designed to test the limits of working memory duration. The task is named for two notable experiments published in the 1950s in which it was first documented, the first by John Brown [1] and the second by husband-and-wife team Lloyd and Margaret Peterson.
Trigrams are a special case of the n-gram, where n is 3. They are often used in natural language processing for performing statistical analysis of texts and in cryptography for control and use of ciphers and codes .
Using trigrams for accelerating searches is a technique used in some systems for code searching, in situations in which queries that are regular expressions may be useful, [5] [2] [7] in search engines such as Elasticsearch, [8] as well as in databases such as PostgreSQL.
Weak ciphers do not sufficiently mask the distribution, and this might be exploited by a cryptanalyst to read the message. In cryptanalysis, frequency analysis (also known as counting letters) is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking classical ciphers.
The small-world experiment comprised several experiments conducted by Stanley Milgram and other researchers examining the average path length for social networks of people in the United States. [1] The research was groundbreaking in that it suggested that human society is a small-world -type network characterized by short path-lengths.
n-grams find use in several areas of computer science, computational linguistics, and applied mathematics. They have been used to: design kernels that allow machine learning algorithms such as support vector machines to learn from string data [citation needed] find likely candidates for the correct spelling of a misspelled word [14]
The experiment became a popular way to illustrate the principles of air pressure, and many smaller copies of the hemispheres were made, and are used to this day in science classes. Reenactments of von Guericke's experiment of 1654 are performed in locations around the world by the Otto von Guericke Society.
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